کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2015120 | 1067518 | 2011 | 9 صفحه PDF | دانلود رایگان |

In this study, physiological and biochemical responses of Centaurea tuzgoluensis, a Turkish endemic halophyte, to salinity were studied. Therefore, the changes in shoot growth, leaf relative water content (RWC), ion concentrations, lipid peroxidation, hydroxyl (OH.) radical scavenging activity, proline (Pro) content, and antioxidant system [superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR)] were investigated. The 60 days (d) old C. tuzgoluensis seedlings were subjected to 0, 150 and 300Â mM NaCl for 7Â d and 14Â d. The relative shoot growth was generally did not change in the 150Â mM NaCl, but reduced with 300Â mM NaCl stress at 7Â d and 14Â d. RWC was higher in 150Â mM NaCl-treated leaves than that of 300Â mM NaCl. Salinity decreased K+/Na+ ratio, but increased Na+, Clâ, Ca+2 and Na+/Clâ ratio in the leaves. On the other hand, it did not change or increase the K+ content at 150 and 300Â mM NaCl, respectively. MDA content in the 150 and 300Â mM NaCl-treated leaves remained close to control at 7Â d. This was related to enhanced activities of SOD, CAT, APX and GR enzymes, and their isoenzymes especially Fe-SOD in the leaves. On the other hand, the higher sensitivity to 300Â mM NaCl at 14Â d was associated with inadequate increase in antioxidant enzymes and the decreased OH radical scavenging activity. All these results suggest that C. tuzgoluensis has different antioxidant metabolisms between short- (7Â d) and long-term (14Â d) salt treatments and salinity tolerance of C. tuzgoluensis might be closely related to increased capacity of antioxidative system to scavenge reactive oxygen species (ROS) and accumulation of osmoprotectant proline under salinity conditions.
⺠C. tuzgoluensis has different antioxidant metabolisms between short and long-term salinity. ⺠Salt tolerance of C. tuzgoluensis might be related to increased capacity of antioxidant system. ⺠Salt tolerance of C. tuzgoluensis would be partially based on to a higher proline accumulation. ⺠Results in this study may be used in breeding programs for introducing salt-tolerant crops.
Journal: Plant Physiology and Biochemistry - Volume 49, Issue 8, August 2011, Pages 816-824